Treat Dymocks like any other retail store. They really don't care if you have a passion for books - they care if you have experience in retail.
that's not entirely true. people come in every day asking for recommendations, so you do need to have some sort of enthusiasm for books.
anyway, when a manager looks at your resume, they're trying to ascertain whether you're suitable for the position. your past experience is the most relevant point, they couldn't really give a toss about whether you like to skateboard, so don't bother listing your hobbies, and if you do, leave it to the last page. referees are obviously important too, you might also want to put down your availability. when it comes to intention, try not to mention if you only want a job for a little while - they're putting time into training you and won't bother hiring if you're only planning to be there for a couple of months.
also, try to make your resume stand out. for example a past co-worker of mine had 'AVAILABLE FOR IMMEDIATE START' at the top of her resume in bright red. you could also get it spiral bound at somewhere like officeworks fairly cheaply, it looks a lot more sophisticated than the dime-a-dozen stapled-together pieces of paper, and also has a degree of seriousness/effort about it.